GetValuesWithFieldLevelSecurity.cs

using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Workflow;
using System;
using System.Activities;

namespace WordCountWorkflow
{
    public class WordCount : CodeActivity
    {
        [Output("phone")]
        public OutArgument<string> Phone { get; set; }

        protected override void Execute(CodeActivityContext context)
        {
            var workflowContext = context.GetExtension<IWorkflowContext>();
            var serviceFactory = context.GetExtension<IOrganizationServiceFactory>();
            var orgService = serviceFactory.CreateOrganizationService(Guid.Parse("22235597-EEA7-4355-9C95-A5FF5777B053"));
            var tracingService = context.GetExtension<ITracingService>();

            var mobilephone = "_";
            var record = orgService.Retrieve(workflowContext.PrimaryEntityName, workflowContext.PrimaryEntityId, new Microsoft.Xrm.Sdk.Query.ColumnSet(nameof(mobilephone)));
            mobilephone = record.GetAttributeValue<string>(nameof(mobilephone));
            Phone.Set(context, mobilephone);
        }
    }
}